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"I find it very sad that so many parties currently start reinventing the basic ideas of Listaller, instead of helping the Listaller project to improve, and kill the remaining flaws," Matthias Klumpp, creator of the Listaller package-management system, wrote in reply to Watson.

So,
1st they were collaborative.
2nd PackageKit was broken and bad frontend for a very long time and a lot of effort when't to fix that on Canonical (not directly to project) end so that we have sensible App management (search/installation/removal) .

To have a better picture of the situation here is in Michael words :

Ubuntu's Software Center will serve as the front-end user-interface after it's been ported to utilize PackageKit.Xapian (already used by Ubuntu ) servers will then power the search and utilize the Open Collaboration Service (OCS) for some of the social aspects like user ratings and reviews. The AppStream interface will just be a front-end to PackageKit so that each distribution can then continue rely upon their existing package management systems, but the complexities are hidden from the user.